Ensure your virtualization platform explicitly enables USB 3.0 (xHCI) controller emulation in the hardware settings panel. Catalina dropped standard compatibility for legacy USB 1.1 controls.
softwareupdate --fetch-full-installer --full-installer-version 10.15.7
If you already have a Mac running Catalina, you can create an ISO of your current system (for backup or cloning). This requires Terminal skills. Download Macos Catalina 10.15.7 Iso File --39-LINK--39-
Apple does not distribute official macOS installers directly in the .iso format; they distribute them as .app bundles via the Mac App Store or as .pkg files. Downloading pre-made ISO files from untrusted third-party links carries significant security risks, including malware infection.
You will need at least 12.5 GB to 18.5 GB of free disk space for the installation. Ensure your virtualization platform explicitly enables USB 3
There are several reasons why you might want to download a macOS Catalina 10.15.7 ISO file:
that:
Running macOS within Windows 10/11 using VMware or VirtualBox.
Mount the image: